The Pokerus I believe appears only in 4th Generation. If it does exist, then you'll need to battle a lot and lot of wild Pokemon. All it takes is a lot of luck!
not many know about the pokevirus except it is said that Pokemon with the virus will be raised very well.
Pokemon ruby's version IS Pokemon ruby.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
ruby
All The Shiney Pokemon You Can Get In Pokemon Ruby Are All The Pokemon You Can Get in Ruby Any Pokemon Can Be Shiney Even Starters and Legendaries. So There Are 200 Shiney Pokemon You Can Get In Pokemon Ruby.
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
you can't get the pokeradar in Pokemon ruby
Pokemon from the 3rd gen (hoenn region) are in ruby
you can't, only ruby Pokemon can go to diamod. but diamond Pokemon can't go to ruby
Pokemon blue to ruby is sapphire.
yes it is on Pokemon ruby
Trade with Ruby.